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Novel Cavities in Ultrafast Vertical External Cavity Surface Emitting Lasers for High Power Harmonic Generation

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Novel Cavities in Ultrafast Vertical External Cavity Surface Emitting Lasers for High Power Harmonic Generation Novel Cavities in Ultrafast Vertical External Cavity Surface Emitting Lasers for High Power Harmonic Generation Item Type text; Electronic Dissertation Authors Meyer, Jason Timothy Citation Meyer, Jason Timothy. (2021). Novel Cavities in Ultrafast Vertical External Cavity Surface Emitting Lasers for High Power Harmonic Generation (Doctoral dissertation, University of Arizona, Tucson, USA). Publisher The University of Arizona. Rights Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction, presentation (such as public display or performance) of protected items is prohibited except with permission of the author. Download date 06/10/2021 03:26:45 Item License http://rightsstatements.org/vocab/InC/1.0/ Link to Item http://hdl.handle.net/10150/660288 NOVEL CAVITIES IN ULTRAFAST VERTICAL EXTERNAL CAVITY SURFACE EMITTING LASERS FOR HIGH POWER HARMONIC GENERATION By Jason T. Meyer Copyright © Jason T. Meyer 2021 A Dissertation Submitted to the Faculty of the JAMES C. WYANT COLLEGE OF OPTICAL SCIENCES In Partial Fulfillment of the Requirements For the Degree of DOCTOR OF PHILOSOPHY In the Graduate College THE UNIVERSITY OF ARIZONA 2021 2 THE UNIVERSITY OF ARIZONA GRADUATE COLLEGE As members of the Dissertation Committee, we certify that we have read the dissertation prepared by Jason Timothy Meyer, titled Novel Cavities in Ultrafast Vertical External Cavity Surface Emitting Lasers for High Power Harmonic Generation and recommend that it be accepted as fulfilling the dissertation requirement for the Degree of Doctor of Philosophy. _________________________________________________________________ Date: ____________5/5/21 Professor Mahmoud Fallahi _________________________________________________________________ Date: ____________5/5/21 Professor Stanley K. H. Pau ____Ewan M. Wright_________________________________________________ Date: _5/5/21____ Professor Ewan M. Wright _________________________________________________________________ Chris Hessenius Date: ____________5/5/21 Professor Chris A. Hessenius Final approval and acceptance of this dissertation is contingent upon the candidate’s submission of the final copies of the dissertation to the Graduate College. I hereby certify that I have read this dissertation prepared under my direction and recommend that it be accepted as fulfilling the dissertation requirement. _________________________________________________________________ Date: ____________5/5/2021 Professor Mahmoud Fallahi Dissertation Committee Chair Wyant College of Optical Sciences Acknowledgements This work is the culmination of nearly sixteen years spent in higher educa- tion. I have benefited from my experiences with so many individuals and I want to immediately offer my apologies to anyone that is missed that deserves to be mentioned. First, I want to thank my wife, Jessica. Without your emotional support over these many years, I never would have gone this far in my academic pursuits. You forever have my unconditional love. Second, I want to thank my mother, Mary Anne. Sixteen years ago, you told me to go to college and made the beginning of this entire journey possible. It’s been quite the adventure since then, but I made it! Third, I need to recognize the importance of Dr. Anthony Pitucco during my early years at Pima Community College. Your insanely difficult physics courses, ridiculous classroom antics, and demonizing of the "Muppets" gave me a focus and arrogance that was central to surviving the transition to university and my eventual doctoral studies. I speak often of my many experiences in your class. I would also like to recognize Dr. Lonnie Burke, a chemistry professor at Pima Community College. You gave me the opportunity to become a tutor at a time when I was still very unsure of myself and it forced me to break out of my shell. You were the first to recognize that I was bound to get a doctorate. Well, I guess you were right! To my committee members, Professor Mahmoud Fallahi, Professor Ewan M. Wright, Professor Stanley Pau, and Dr. Chris Hessenius... Thank you for taking the time to review and provide advice on this dissertation. I would also like to thank Mahmoud and Chris for providing me with all the research opportunities that have allowed me to develop my diverse skill set. A special thanks goes to Ewan for the many semesters of independent studies and years of research discussions. You devoted a significant amount of time to my success and I greatly appreciate it. 3 For Michal L. Lukowski and Chris, thanks for the years of interesting discus- sions involving lasers, politics, sports, etc. It has been quite the ride in this lab group! I also feel compelled to single out Roland Himmelhuber for all the time he spent helping me in the cleanroom with numerous annoying equipment failures. Thank you. You can throw away the Denton now. I don’t need it anymore. Now, for everyone else I am about to list, I would like to thank you for being a part of my academic life in some way, big or small, that gave me a new per- spective, helped me grow professionally, or simply offered friendship during this long journey: Darryl Graham, Dale Karas, Allison Huff, Ameé Hennig, Majid Behabadi, Melissa Sarmiento, Gregg Curé, Soha Namnabat, Nathan Gottesman, Erica Bosset, the Manley family, and all the former tutors at PCC East Campus. 4 Dedication For all the high school dropouts that didn’t know where they would end up... 5 Contents List of Figures 9 List of Tables 16 Abstract 17 1 Introduction to VECSELs 19 1.1 Brief History . 19 1.2 Semiconductor Chip Structure . 22 1.2.1 Active Region . 23 1.2.2 DBR Region . 25 1.2.3 Thermal Considerations . 26 1.2.4 Microfabrication Procedure . 27 1.3 Basics of Operation . 29 2 Introduction to Ultrafast VECSELs 31 2.1 Brief History . 31 2.2 SESAM Design . 32 2.2.1 Basics of Operation . 35 2.2.2 Cavity Design . 36 2.2.3 Characterization . 38 3 Ultrafast VECSEL Resonator Design and Pulse Modeling 43 3.1 ABCD Transfer Matrix Method for Resonator Design . 43 3.1.1 Theory . 44 6 3.1.2 Linear Cavity . 47 3.1.3 V-Cavity . 48 3.1.4 Z-Cavity . 50 3.2 Operator Method for Pulse Modeling . 52 3.2.1 Theory . 53 3.2.2 Operator Definitions . 54 3.2.3 Pulse Formation Models . 57 4 Nonlinear Frequency Conversion 59 4.1 Second Harmonic Generation . 59 4.2 Angle Phase Matching . 62 4.3 Considerations for Ultrashort Pulses . 64 4.3.1 Group Velocity Dispersion . 64 4.3.2 Group Velocity Mismatch . 65 4.4 Second Harmonic Pulse Modeling . 66 5 High Peak Power Second Harmonic Generation in an Ultrafast VECSEL 68 5.1 Brief History . 68 5.2 W-Cavity Resonator Design and Optimization . 70 5.3 Experimental Results . 73 5.3.1 Fundamental Characterization . 73 5.3.2 Second Harmonic Characterization . 76 6 All-Intracavity Fourth Harmonic Generation in an Ultrafast VECSEL for Deep UV Emission 80 6.1 Brief History . 80 6.2 Overlapped Resonator Cavity Design . 81 6.3 Experimental Results . 83 7 7 Ultrafast 1550 nm VECSEL 92 7.1 Brief History . 92 7.2 Semiconductor Chip Design . 93 7.2.1 Active Region . 93 7.2.2 DBR Mirror . 96 7.2.3 Full Chip Reflectivity and Detuning . 99 7.3 Z-Cavity Resonator . 101 8 Generation of Higher Order Hermite-Gaussian and Laguerre-Gaussian Beams in an Ultrafast VECSEL 103 8.1 Brief History . 103 8.2 Initial Experimental Results . 105 8.3 Future Work . 110 9 Conclusion 111 References 113 8 List of Figures 1.1 Edge-emitting semiconductor laser. 20 1.2 Surface-emitting semiconductor laser. 20 1.3 VECSEL linear cavity. The VECSEL chip contains a DBR mir- ror and the gain section, and the laser cavity is completed by the external output coupler mirror and optical pump. 21 1.4 Multi-quantum well semiconductor structure. The "active" gain region contains barriers and quantum wells for absorption of in- coming pump photons and emission of fundamental photons. The DBR mirror provides >99.9% reflectivity of the fundamental photons. 23 1.5 Section of active region depicting a single quantum well sandwiched between two barrier sections. A pump photon is absorbed in the barrier, exciting an electron from the valence band to the conduc- tion band. This electron diffuses into the quantum well, with its transition to the valence band well emitting a photon at the funda- mental design wavelength. 24 1.6 Flowchart of the microfabrication procedure used to solder-bond the MQW gain chip to a CVD diamond heat sink for efficient heat dissipation. This process requires a bottom-emitter wafer design, where the active region is grown first on the substrate, followed by the DBR section. 28 2.1 Layer schematic of SESAM. The DBR stack is high reflectivity for the fundamental wavelength. The single quantum well acts as the absorber. There is typically a thin capping layer applied to protect the chip from damage. 33 9 2.2 Basic functionality of a SESAM acting as a slow saturable absorber. In (a), incoming photons excite an electron from the valence to conduction band. This electron eventually transitions back to the valence band following the recovery time. In (b), the saturation fluence has been reached and the absorber is bleached. 34 2.3 Pulse formation with dynamic gain and absorption, such as that with a passively mode locked VECSEL utilizing a SESAM. 35 2.4 Passively mode locked VECSEL in Z- and V-cavity configurations. The SESAM is acting as an end mirror in both of these configura- tions, which allows for designing a different mode area on the gain and absorber. 37 2.5 Linear cavity incorporating a mode-locked integrated external-cavity surface-emitting laser. The semiconductor chip incorporates the gain (quantum wells) and absorber (quantum dots) onto the same structure.
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